00-04-M184EN
GENERAL CONTROL AND ADJUSTMENT
STANDARD TIGHTENING TORQUES
Standard tightening torque to be used when not otherwise indicated in the removal and re tting
operations:
- The following tightening torques are given for hexagon head screws without flanges and
cylinder head hexagon socket screws.
- The torques are given for a friction coe cient μ = 0,20 corresponding to dry- tted zinc-plated
fasteners and for torque tools having a ± 20 % class C tightening torque accuracy (equivalent
to pneumatic screwdrivers).
NF E 25-030-1 Screw / Nut connection :
Tightening torque in N•m (±20%)
Ø x “coarse” pitch Grade 8.8 Grade 10.9 Ø x “ ne” pitch Grade 8.8 Grade 10.9
M3 x 0,5 1 1,5 - - -
M4 x 0,7 2,4 3,5 - - -
M5 x 0,8 4,8 7,1 - - -
M6 x 1 8,2 12,1 - - -
M8 x 1,25 20 30 M8 x 1 22 32
M10 x 1,5 40 59
M10 x 1,25 43 63
M10 x 1 46 68
M12 x 1,75 69 102
M12 x 1,5 74 108
M12 x 1,25 78 115
M14 x 2 111 163 M14 x 1,5 123 181
M16 x 2 175 256 M16 x 1,5 190 279
M18 x 2,5 240 352 M18 x 1,5 279 410
M20 x 2,5 341 501 M20 x 1,5 391 574
M22 x 2,5 470 691 M22 x 1,5 531 780
M24 x 3 588 864 M24 x 2 659 967
M27 x 3 874 1284 M27 x 2 965 1418
M30 x 3,5 1181 1735 M30 x 2 1351 1984
M33 x 3,5 1614 2371 M33 x 2 1821 2674
M36 x 4 2068 3037 - - -
b
For hexagon screws with anges:
Apply an increased torque of +10%.
(Standard NF E 25-030-1)
bWhere washers are used, the following coe cient is to be applied (FD E 25-502) :
- Smooth tapered washer (CL): +5%
- Spring (or Grower) washer without jaws (W) : +10%
- Conical, internal teeth (CDJ-JZC) : +15%
(05/06/2012)
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